The BBC committed a "significant breach" of industry standards by omitting to mention that the presenter of a documentary about the Gaza situation was the offspring of a Hamas official, as ruled by British broadcasting authority Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, stating there had been "a serious error in relation to truthfulness".
The authority has ordered the BBC to transmit a evening statement about its decisions.
"Given this constitutes a significant violation of our rules, we are ordering the BBC to transmit a message of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be determined," it said.
'Risk to Damage Credibility'
The watchdog's statement said: "Our investigation determined that the programme's omission to reveal that the voice's parent served in a position in the Hamas-controlled authority was significantly deceptive.
"It meant that the viewers did not have critical information which may have been highly relevant to their judgment of the voice and the details he shared.
"Trust is at the heart of the connection between a television network and its viewers, particularly for a public service broadcaster such as the BBC.
"This oversight had the potential to undermine the exceptionally strong levels of confidence that audiences would have put in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from the online platform in last February after the presenter's personal associations were revealed, and in July an internal BBC review concluded it infringed the broadcaster's journalistic standards on accuracy.
A BBC spokesperson commented: "The Ofcom ruling is in accordance with the findings of Peter Johnston's review, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will adhere to the penalty as soon as the schedule and wording are finalised."
